Supported integrated catalyst for formaldehyde purification and preparation method thereof

A monolithic catalyst, formaldehyde purification technology, applied in physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the complex preparation process of honeycomb catalysts and poor catalyst strength. , the coating layer is easy to fall off and other problems, to achieve the effect of easy promotion and application, small wind resistance and convenient operation

Active Publication Date: 2014-04-23
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the problems faced by the above-mentioned formaldehyde purification catalysts, the purpose of the present invention is to solve the shortcomings of the traditional granular supported noble metal catalyst bed layer resistance, poor catalyst strength, etc., and the preparation process of the honeycomb catalyst is complicated and the coating layer is easy to fall off during use. Stability issues such as, provide a kind of monolithic catalyst for oxidizing formaldehyde with long-range disorder and short-range orderly structure and its preparation method

Method used

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Effect test

Embodiment 1

[0026] A supported monolithic catalyst for formaldehyde purification, the catalyst is composed of a titanium dioxide nanotube array carrier and a noble metal loaded on the carrier. The mineral phase structure of the carrier is anatase phase, and the tube diameter is ~ 100 nm. The noble metal active component is platinum, and the weight percentage of platinum is 1% based on the weight of the catalyst as 100%. First, the titania nanotube array carrier was calcined at 500°C in the air for 5 hours, and the solution containing the required amount of chloroplatinic acid precursor was impregnated on the carrier by an equal-volume impregnation method, dried overnight at 80°C in air and calcined at 400°C. 4 hours. The prepared quasi-monolithic catalyst in H 2 Reduction in atmosphere and at 300° C. for 3 hours to prepare a supported monolithic catalyst for purifying formaldehyde at room temperature.

[0027]

Embodiment 2

[0029] A supported monolithic catalyst for formaldehyde purification, the catalyst is composed of a titanium dioxide nanotube array carrier and a noble metal loaded on the carrier. The mineral phase structure of the carrier is anatase phase, and the tube diameter is ~ 100 nm. The noble metal active component is platinum, and the weight percentage of platinum is 0.5% based on the weight of the catalyst as 100%. First, the titania nanotube array carrier was calcined at 500°C in the air for 5 hours, and the solution containing the required amount of chloroplatinic acid precursor was impregnated on the carrier by an equal-volume impregnation method, dried overnight at 80°C in air and calcined at 400°C. 4 hours. The prepared quasi-monolithic catalyst was treated with NaBH 4 The solution is reduced and then dried to obtain a supported monolithic catalyst for purifying formaldehyde at room temperature. The molar ratio of the added amount of sodium borohydride used to the noble met...

Embodiment 3

[0032] A supported monolithic catalyst for formaldehyde purification, the catalyst is composed of a titanium dioxide nanotube array carrier and a noble metal loaded on the carrier. The mineral phase structure of the carrier is anatase phase, and the tube diameter is ~ 100 nm. The active component of the noble metal is gold, and the weight percentage of gold is 5% based on the weight of the catalyst as 100%. Firstly, the titania nanotube array carrier was calcined at 500°C in the air for 5 hours, and the solution containing the required amount of chloroauric acid precursor was impregnated on the carrier by an equal volume impregnation method, dried overnight at 80°C in the air and calcined at 400°C. 4 hours. The prepared quasi-monolithic catalyst in H 2 Reduction in atmosphere and at 300° C. for 3 hours to prepare a supported monolithic catalyst for purifying formaldehyde at room temperature.

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Abstract

The invention discloses a supported integrated catalyst for formaldehyde purification and a preparation method thereof. The supported integrated catalyst consists of a titanium dioxide nanotube array supporter and precious metal M, wherein the precious metal M is one or a mixture of at least two of Pt, Ru, Rh, Pd and Au. The titanium dioxide nanotube array supporter is soaked in a precursor solution containing the precious metal and then is roasted to obtain a precious-metal-component-supported catalyst, and the catalyst is reduced through hydrogen or a reducing solution and can be directly used for catalytically purifying formaldehyde. The catalyst is simple in composition and preparation flow, and convenient to popularize and apply. The high activity and stability of the catalyst on the formaldehyde can be kept at low temperature, the formaldehyde can be catalytically oxidized under the condition that other additional devices are not needed, and can be converted into harmless H2O and CO2, and thus the green elimination of the formaldehyde is further realized.

Description

technical field [0001] The invention relates to the technical field of formaldehyde purification, in particular to a supported monolithic catalyst for formaldehyde purification and a preparation method thereof. Background technique [0002] Formaldehyde, also known as formaldehyde, has strong carcinogenic and cancer-promoting effects, and is one of the important VOCs (Volatile Organic Compounds) pollutants. With the progress of society and the improvement of material living standards, people's requirements for the environment are also constantly improving. It is of great significance to study the formaldehyde purification technology in the air and improve the indoor air quality. At present, the methods used to remove formaldehyde in the air include adsorption method, catalytic oxidation method, biodegradation method, plasma technology, etc., and these methods have their own advantages and disadvantages. At present, the most commonly used method is the adsorption method...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/42B01J23/52B01J23/44B01J23/46B01D53/86B01D53/72
Inventor 纪红兵陈铧耀芮泽宝
Owner SUN YAT SEN UNIV
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